inherit mapnik::util::variant from mapbox::variant and add mapbox::variant as submodule

This commit is contained in:
artemp 2016-01-14 15:02:41 +00:00
parent cc635df7bc
commit 3333f3e1fa
7 changed files with 14 additions and 1061 deletions

3
.gitmodules vendored
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@ -6,3 +6,6 @@
path = test/data-visual path = test/data-visual
url = https://github.com/mapnik/test-data-visual.git url = https://github.com/mapnik/test-data-visual.git
branch = master branch = master
[submodule "deps/mapbox/variant"]
path = deps/mapbox/variant
url = https://github.com/mapbox/variant.git

1
deps/mapbox/variant vendored Submodule

@ -0,0 +1 @@
Subproject commit 861faa8125ae7c2d9e41e33b3d5d97a17213c415

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@ -1,150 +0,0 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP
#define MAPNIK_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP
#include <utility>
namespace mapnik { namespace util {
template <typename T>
class recursive_wrapper
{
public:
using type = T;
private:
T* p_;
public:
~recursive_wrapper();
recursive_wrapper();
recursive_wrapper(recursive_wrapper const& operand);
recursive_wrapper(T const& operand);
recursive_wrapper(recursive_wrapper&& operand);
recursive_wrapper(T&& operand);
private:
void assign(const T& rhs);
public:
inline recursive_wrapper& operator=(recursive_wrapper const& rhs)
{
assign( rhs.get() );
return *this;
}
inline recursive_wrapper& operator=(T const& rhs)
{
assign( rhs );
return *this;
}
inline void swap(recursive_wrapper& operand) noexcept
{
T* temp = operand.p_;
operand.p_ = p_;
p_ = temp;
}
recursive_wrapper& operator=(recursive_wrapper&& rhs) noexcept
{
swap(rhs);
return *this;
}
recursive_wrapper& operator=(T&& rhs)
{
get() = std::move(rhs);
return *this;
}
public:
T& get() { return *get_pointer(); }
const T& get() const { return *get_pointer(); }
T* get_pointer() { return p_; }
const T* get_pointer() const { return p_; }
operator T const&() const { return this->get(); }
operator T&() { return this->get(); }
};
template <typename T>
recursive_wrapper<T>::~recursive_wrapper()
{
delete p_;
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper()
: p_(new T)
{
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(recursive_wrapper const& operand)
: p_(new T( operand.get() ))
{
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(T const& operand)
: p_(new T(operand))
{
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(recursive_wrapper&& operand)
: p_(operand.p_)
{
operand.p_ = nullptr;
}
template <typename T>
recursive_wrapper<T>::recursive_wrapper(T&& operand)
: p_(new T( std::move(operand) ))
{
}
template <typename T>
void recursive_wrapper<T>::assign(const T& rhs)
{
this->get() = rhs;
}
template <typename T>
inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs) noexcept
{
lhs.swap(rhs);
}
}}
#endif // MAPNIK_UTIL_VARIANT_RECURSIVE_WRAPPER_HPP

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@ -24,854 +24,27 @@
#define MAPNIK_UTIL_VARIANT_HPP #define MAPNIK_UTIL_VARIANT_HPP
#include <mapnik/config.hpp> #include <mapnik/config.hpp>
#include <utility> // swap
#include <typeinfo>
#include <type_traits>
#include <stdexcept> // runtime_error
#include <new> // operator new
#include <cstddef> // size_t
#include <iosfwd>
#include <string>
#include "recursive_wrapper.hpp"
#include <boost/mpl/vector.hpp> // spirit support #include <boost/mpl/vector.hpp> // spirit support
#include <mapbox/variant/variant.hpp>
#ifdef _MSC_VER
// http://msdn.microsoft.com/en-us/library/z8y1yy88.aspx
#ifdef NDEBUG
#define VARIANT_INLINE __forceinline
#else
#define VARIANT_INLINE __declspec(noinline)
#endif
#else
#ifdef NDEBUG
#define VARIANT_INLINE inline __attribute__((always_inline))
#else
#define VARIANT_INLINE __attribute__((noinline))
#endif
#endif
#define VARIANT_MAJOR_VERSION 0
#define VARIANT_MINOR_VERSION 1
#define VARIANT_PATCH_VERSION 0
// translates to 100
#define VARIANT_VERSION (VARIANT_MAJOR_VERSION*100000) + (VARIANT_MINOR_VERSION*100) + (VARIANT_PATCH_VERSION)
namespace mapnik { namespace util { namespace mapnik { namespace util {
// static visitor
template <typename R = void>
struct static_visitor
{
using result_type = R;
protected:
static_visitor() {}
~static_visitor() {}
};
namespace detail {
static constexpr std::size_t invalid_value = std::size_t(-1);
template <typename T, typename...Types>
struct direct_type;
template <typename T, typename First, typename...Types>
struct direct_type<T, First, Types...>
{
static constexpr std::size_t index = std::is_same<T, First>::value
? sizeof...(Types) : direct_type<T, Types...>::index;
};
template <typename T> template <typename T>
struct direct_type<T> using recursive_wrapper = typename mapbox::util::recursive_wrapper<T>;
{
static constexpr std::size_t index = invalid_value;
};
template <typename T, typename...Types>
struct convertible_type;
template <typename T, typename First, typename...Types>
struct convertible_type<T, First, Types...>
{
static constexpr std::size_t index = std::is_convertible<T, First>::value
? sizeof...(Types) : convertible_type<T, Types...>::index;
};
template <typename T>
struct convertible_type<T>
{
static constexpr std::size_t index = invalid_value;
};
template <typename T, typename...Types>
struct value_traits
{
static constexpr std::size_t direct_index = direct_type<T, Types...>::index;
static constexpr std::size_t index =
(direct_index == invalid_value) ? convertible_type<T, Types...>::index : direct_index;
};
// check if T is in Types...
template <typename T, typename...Types>
struct has_type;
template <typename T, typename First, typename... Types>
struct has_type<T, First, Types...>
{
static constexpr bool value = std::is_same<T, First>::value
|| has_type<T, Types...>::value;
};
template <typename T>
struct has_type<T> : std::false_type {};
//
template <typename T, typename...Types>
struct is_valid_type;
template <typename T, typename First, typename... Types>
struct is_valid_type<T, First, Types...>
{
static constexpr bool value = std::is_convertible<T, First>::value
|| is_valid_type<T, Types...>::value;
};
template <typename T>
struct is_valid_type<T> : std::false_type {};
template <std::size_t N, typename ... Types>
struct select_type
{
static_assert(N < sizeof...(Types), "index out of bounds");
};
template <std::size_t N, typename T, typename ... Types>
struct select_type<N, T, Types...>
{
using type = typename select_type<N - 1, Types...>::type;
};
template <typename T, typename ... Types>
struct select_type<0, T, Types...>
{
using type = T;
};
template <typename T, typename R = void>
struct enable_if_type { using type = R; };
template <typename F, typename V, typename Enable = void>
struct result_of_unary_visit
{
using type = typename std::result_of<F(V&)>::type;
};
template <typename F, typename V>
struct result_of_unary_visit<F, V, typename enable_if_type<typename F::result_type>::type >
{
using type = typename F::result_type;
};
template <typename F, typename V, class Enable = void>
struct result_of_binary_visit
{
using type = typename std::result_of<F(V&,V&)>::type;
};
template <typename F, typename V>
struct result_of_binary_visit<F, V, typename enable_if_type<typename F::result_type>::type >
{
using type = typename F::result_type;
};
} // namespace detail
template <std::size_t arg1, std::size_t ... others>
struct static_max;
template <std::size_t arg>
struct static_max<arg>
{
static const std::size_t value = arg;
};
template <std::size_t arg1, std::size_t arg2, std::size_t ... others>
struct static_max<arg1, arg2, others...>
{
static const std::size_t value = arg1 >= arg2 ? static_max<arg1, others...>::value :
static_max<arg2, others...>::value;
};
template<typename... Types> template<typename... Types>
struct variant_helper; class variant : public mapbox::util::variant<Types...>
template<typename T, typename... Types>
struct variant_helper<T, Types...>
{
VARIANT_INLINE static void destroy(const std::size_t id, void * data)
{
if (id == sizeof...(Types))
{
reinterpret_cast<T*>(data)->~T();
}
else
{
variant_helper<Types...>::destroy(id, data);
}
}
VARIANT_INLINE static void move(const std::size_t old_id, void * old_value, void * new_value)
{
if (old_id == sizeof...(Types))
{
new (new_value) T(std::move(*reinterpret_cast<T*>(old_value)));
//std::memcpy(new_value, old_value, sizeof(T));
// ^^ DANGER: this should only be considered for relocatable types e.g built-in types
// Also, I don't see any measurable performance benefit just yet
}
else
{
variant_helper<Types...>::move(old_id, old_value, new_value);
}
}
VARIANT_INLINE static void copy(const std::size_t old_id, const void * old_value, void * new_value)
{
if (old_id == sizeof...(Types))
{
new (new_value) T(*reinterpret_cast<const T*>(old_value));
}
else
{
variant_helper<Types...>::copy(old_id, old_value, new_value);
}
}
VARIANT_INLINE static void direct_swap(const std::size_t id, void * lhs, void * rhs)
{
using std::swap; //enable ADL
if (id == sizeof...(Types))
{
// both lhs and rhs hold T
swap(*reinterpret_cast<T*>(lhs), *reinterpret_cast<T*>(rhs));
}
else
{
variant_helper<Types...>::direct_swap(id, lhs, rhs);
}
}
};
template<> struct variant_helper<>
{
VARIANT_INLINE static void destroy(const std::size_t, void *) {}
VARIANT_INLINE static void move(const std::size_t, void *, void *) {}
VARIANT_INLINE static void copy(const std::size_t, const void *, void *) {}
VARIANT_INLINE static void direct_swap(const std::size_t, void *, void *) {}
};
namespace detail {
template <typename T>
struct unwrapper
{
static T const& apply_const(T const& obj) {return obj;}
static T& apply(T & obj) {return obj;}
};
template <typename T>
struct unwrapper<recursive_wrapper<T>>
{
static auto apply_const(recursive_wrapper<T> const& obj)
-> typename recursive_wrapper<T>::type const&
{
return obj.get();
}
static auto apply(recursive_wrapper<T> & obj)
-> typename recursive_wrapper<T>::type&
{
return obj.get();
}
};
template <typename T>
struct unwrapper<std::reference_wrapper<T>>
{
static auto apply_const(std::reference_wrapper<T> const& obj)
-> typename std::reference_wrapper<T>::type const&
{
return obj.get();
}
static auto apply(std::reference_wrapper<T> & obj)
-> typename std::reference_wrapper<T>::type&
{
return obj.get();
}
};
template <typename F, typename V, typename R, typename...Types>
struct dispatcher;
template <typename F, typename V, typename R, typename T, typename...Types>
struct dispatcher<F, V, R, T, Types...>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const& v, F f)
{
if (v.get_type_index() == sizeof...(Types))
{
return f(unwrapper<T>::apply_const(v. template get<T>()));
}
else
{
return dispatcher<F, V, R, Types...>::apply_const(v, f);
}
}
VARIANT_INLINE static result_type apply(V & v, F f)
{
if (v.get_type_index() == sizeof...(Types))
{
return f(unwrapper<T>::apply(v. template get<T>()));
}
else
{
return dispatcher<F, V, R, Types...>::apply(v, f);
}
}
};
template<typename F, typename V, typename R>
struct dispatcher<F, V, R>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const&, F)
{
throw std::runtime_error(std::string("unary dispatch: FAIL ") + typeid(V).name());
}
VARIANT_INLINE static result_type apply(V &, F)
{
throw std::runtime_error(std::string("unary dispatch: FAIL ") + typeid(V).name());
}
};
template <typename F, typename V, typename R, typename T, typename...Types>
struct binary_dispatcher_rhs;
template <typename F, typename V, typename R, typename T0, typename T1, typename...Types>
struct binary_dispatcher_rhs<F, V, R, T0, T1, Types...>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const& lhs, V const& rhs, F f)
{
if (rhs.get_type_index() == sizeof...(Types)) // call binary functor
{
return f(unwrapper<T0>::apply_const(lhs. template get<T0>()),
unwrapper<T1>::apply_const(rhs. template get<T1>()));
}
else
{
return binary_dispatcher_rhs<F, V, R, T0, Types...>::apply_const(lhs, rhs, f);
}
}
VARIANT_INLINE static result_type apply(V & lhs, V & rhs, F f)
{
if (rhs.get_type_index() == sizeof...(Types)) // call binary functor
{
return f(unwrapper<T0>::apply(lhs. template get<T0>()),
unwrapper<T1>::apply(rhs. template get<T1>()));
}
else
{
return binary_dispatcher_rhs<F, V, R, T0, Types...>::apply(lhs, rhs, f);
}
}
};
template<typename F, typename V, typename R, typename T>
struct binary_dispatcher_rhs<F, V, R, T>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const&, V const&, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
VARIANT_INLINE static result_type apply(V &, V &, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
};
template <typename F, typename V, typename R, typename T, typename...Types>
struct binary_dispatcher_lhs;
template <typename F, typename V, typename R, typename T0, typename T1, typename...Types>
struct binary_dispatcher_lhs<F, V, R, T0, T1, Types...>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const& lhs, V const& rhs, F f)
{
if (lhs.get_type_index() == sizeof...(Types)) // call binary functor
{
return f(unwrapper<T1>::apply_const(lhs. template get<T1>()),
unwrapper<T0>::apply_const(rhs. template get<T0>()));
}
else
{
return binary_dispatcher_lhs<F, V, R, T0, Types...>::apply_const(lhs, rhs, f);
}
}
VARIANT_INLINE static result_type apply(V & lhs, V & rhs, F f)
{
if (lhs.get_type_index() == sizeof...(Types)) // call binary functor
{
return f(unwrapper<T1>::apply(lhs. template get<T1>()),
unwrapper<T0>::apply(rhs. template get<T0>()));
}
else
{
return binary_dispatcher_lhs<F, V, R, T0, Types...>::apply(lhs, rhs, f);
}
}
};
template<typename F, typename V, typename R, typename T>
struct binary_dispatcher_lhs<F, V, R, T>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const&, V const&, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
VARIANT_INLINE static result_type apply(V &, V &, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
};
template <typename F, typename V, typename R, typename...Types>
struct binary_dispatcher;
template <typename F, typename V, typename R, typename T, typename...Types>
struct binary_dispatcher<F, V, R, T, Types...>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const& v0, V const& v1, F f)
{
if (v0.get_type_index() == sizeof...(Types))
{
if (v0.get_type_index() == v1.get_type_index())
{
return f(unwrapper<T>::apply_const(v0. template get<T>()),
unwrapper<T>::apply_const(v1. template get<T>())); // call binary functor
}
else
{
return binary_dispatcher_rhs<F, V, R, T, Types...>::apply_const(v0, v1, f);
}
}
else if (v1.get_type_index() == sizeof...(Types))
{
return binary_dispatcher_lhs<F, V, R, T, Types...>::apply_const(v0, v1, f);
}
return binary_dispatcher<F, V, R, Types...>::apply_const(v0, v1, f);
}
VARIANT_INLINE static result_type apply(V & v0, V & v1, F f)
{
if (v0.get_type_index() == sizeof...(Types))
{
if (v0.get_type_index() == v1.get_type_index())
{
return f(unwrapper<T>::apply(v0. template get<T>()),
unwrapper<T>::apply(v1. template get<T>())); // call binary functor
}
else
{
return binary_dispatcher_rhs<F, V, R, T, Types...>::apply(v0, v1, f);
}
}
else if (v1.get_type_index() == sizeof...(Types))
{
return binary_dispatcher_lhs<F, V, R, T, Types...>::apply(v0, v1, f);
}
return binary_dispatcher<F, V, R, Types...>::apply(v0, v1, f);
}
};
template<typename F, typename V, typename R>
struct binary_dispatcher<F, V, R>
{
using result_type = R;
VARIANT_INLINE static result_type apply_const(V const&, V const&, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
VARIANT_INLINE static result_type apply(V &, V &, F)
{
throw std::runtime_error("binary dispatch: FAIL");
}
};
// comparator functors
struct equal_comp
{
template <typename T>
bool operator()(T const& lhs, T const& rhs) const
{
return lhs == rhs;
}
};
struct less_comp
{
template <typename T>
bool operator()(T const& lhs, T const& rhs) const
{
return lhs < rhs;
}
};
template <typename Variant, typename Comp>
class comparer
{ {
public: public:
explicit comparer(Variant const& lhs) noexcept
: lhs_(lhs) {}
comparer& operator=(comparer const&) = delete;
// visitor
template<typename T>
bool operator()(T const& rhs_content) const
{
T const& lhs_content = lhs_.template get<T>();
return Comp()(lhs_content, rhs_content);
}
private:
Variant const& lhs_;
};
} // namespace detail
struct no_init {};
template<typename... Types>
class variant
{
private:
static const std::size_t data_size = static_max<sizeof(Types)...>::value;
static const std::size_t data_align = static_max<alignof(Types)...>::value;
using data_type = typename std::aligned_storage<data_size, data_align>::type;
using helper_type = variant_helper<Types...>;
std::size_t type_index;
data_type data;
public:
// tell spirit that this is an adapted variant // tell spirit that this is an adapted variant
struct adapted_variant_tag; struct adapted_variant_tag;
using types = boost::mpl::vector<Types...>; using types = boost::mpl::vector<Types...>;
// inherit ctor's
VARIANT_INLINE variant() using mapbox::util::variant<Types...>::variant;
: type_index(sizeof...(Types) - 1)
{
new (&data) typename detail::select_type<0, Types...>::type();
}
VARIANT_INLINE variant(no_init)
: type_index(detail::invalid_value) {}
// http://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers
template <typename T, class = typename std::enable_if<
detail::is_valid_type<typename std::remove_reference<T>::type, Types...>::value>::type>
VARIANT_INLINE variant(T && val) noexcept
: type_index(detail::value_traits<typename std::remove_reference<T>::type, Types...>::index)
{
constexpr std::size_t index = sizeof...(Types) - detail::value_traits<typename std::remove_reference<T>::type, Types...>::index - 1;
using target_type = typename detail::select_type<index, Types...>::type;
new (&data) target_type(std::forward<T>(val)); // nothrow
}
VARIANT_INLINE variant(variant<Types...> const& old)
: type_index(old.type_index)
{
helper_type::copy(old.type_index, &old.data, &data);
}
VARIANT_INLINE variant(variant<Types...>&& old) noexcept
: type_index(old.type_index)
{
helper_type::move(old.type_index, &old.data, &data);
}
private:
VARIANT_INLINE void copy_assign(variant<Types...> const& rhs)
{
helper_type::destroy(type_index, &data);
type_index = detail::invalid_value;
helper_type::copy(rhs.type_index, &rhs.data, &data);
type_index = rhs.type_index;
}
VARIANT_INLINE void move_assign(variant<Types...> && rhs)
{
helper_type::destroy(type_index, &data);
type_index = detail::invalid_value;
helper_type::move(rhs.type_index, &rhs.data, &data);
type_index = rhs.type_index;
}
public:
VARIANT_INLINE variant<Types...>& operator=(variant<Types...> && other)
{
move_assign(std::move(other));
return *this;
}
VARIANT_INLINE variant<Types...>& operator=(variant<Types...> const& other)
{
copy_assign(other);
return *this;
}
// conversions
// move-assign
template <typename T>
VARIANT_INLINE variant<Types...>& operator=(T && rhs) noexcept
{
variant<Types...> temp(std::forward<T>(rhs));
move_assign(std::move(temp));
return *this;
}
// copy-assign
template <typename T>
VARIANT_INLINE variant<Types...>& operator=(T const& rhs)
{
variant<Types...> temp(rhs);
copy_assign(temp);
return *this;
}
template<typename T>
VARIANT_INLINE bool is() const
{
static_assert(detail::has_type<T, Types...>::value, "invalid type in T in `is<T>()` for this variant");
return (type_index == detail::direct_type<T, Types...>::index);
}
VARIANT_INLINE bool valid() const
{
return (type_index != detail::invalid_value);
}
template<typename T, typename... Args>
VARIANT_INLINE void set(Args&&... args)
{
helper_type::destroy(type_index, &data);
new (&data) T(std::forward<Args>(args)...);
type_index = detail::direct_type<T, Types...>::index;
}
// get<T>()
template<typename T, typename std::enable_if<
(detail::direct_type<T, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T& get()
{
if (type_index == detail::direct_type<T, Types...>::index)
{
return *reinterpret_cast<T*>(&data);
}
else
{
throw std::runtime_error("in get<T>()");
}
}
template <typename T, typename std::enable_if<
(detail::direct_type<T, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T const& get() const
{
if (type_index == detail::direct_type<T, Types...>::index)
{
return *reinterpret_cast<T const*>(&data);
}
else
{
throw std::runtime_error("in get<T>()");
}
}
// get<T>() - T stored as recursive_wrapper<T>
template <typename T, typename std::enable_if<
(detail::direct_type<recursive_wrapper<T>, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T& get()
{
if (type_index == detail::direct_type<recursive_wrapper<T>, Types...>::index)
{
return (*reinterpret_cast<recursive_wrapper<T>*>(&data)).get();
}
else
{
throw std::runtime_error("in get<T>()");
}
}
template <typename T,typename std::enable_if<
(detail::direct_type<recursive_wrapper<T>, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T const& get() const
{
if (type_index == detail::direct_type<recursive_wrapper<T>, Types...>::index)
{
return (*reinterpret_cast<recursive_wrapper<T> const*>(&data)).get();
}
else
{
throw std::runtime_error("in get<T>()");
}
}
// get<T>() - T stored as std::reference_wrapper<T>
template <typename T, typename std::enable_if<
(detail::direct_type<std::reference_wrapper<T>, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T& get()
{
if (type_index == detail::direct_type<std::reference_wrapper<T>, Types...>::index)
{
return (*reinterpret_cast<std::reference_wrapper<T>*>(&data)).get();
}
else
{
throw std::runtime_error("in get<T>()");
}
}
template <typename T,typename std::enable_if<
(detail::direct_type<std::reference_wrapper<T const>, Types...>::index != detail::invalid_value)
>::type* = nullptr>
VARIANT_INLINE T const& get() const
{
if (type_index == detail::direct_type<std::reference_wrapper<T const>, Types...>::index)
{
return (*reinterpret_cast<std::reference_wrapper<T const> const*>(&data)).get();
}
else
{
throw std::runtime_error("in get<T>()");
}
}
VARIANT_INLINE std::size_t get_type_index() const
{
return type_index;
}
VARIANT_INLINE int which() const noexcept
{
return static_cast<int>(sizeof...(Types) - type_index - 1);
}
// visitor
// unary
template <typename F, typename V>
auto VARIANT_INLINE
static visit(V const& v, F f)
-> decltype(detail::dispatcher<F, V,
typename detail::result_of_unary_visit<F,
typename detail::select_type<0, Types...>::type>::type, Types...>::apply_const(v, f))
{
using R = typename detail::result_of_unary_visit<F, typename detail::select_type<0, Types...>::type>::type;
return detail::dispatcher<F, V, R, Types...>::apply_const(v, f);
}
// non-const
template <typename F, typename V>
auto VARIANT_INLINE
static visit(V & v, F f)
-> decltype(detail::dispatcher<F, V,
typename detail::result_of_unary_visit<F,
typename detail::select_type<0, Types...>::type>::type, Types...>::apply(v, f))
{
using R = typename detail::result_of_unary_visit<F, typename detail::select_type<0, Types...>::type>::type;
return detail::dispatcher<F, V, R, Types...>::apply(v, f);
}
// binary
// const
template <typename F, typename V>
auto VARIANT_INLINE
static binary_visit(V const& v0, V const& v1, F f)
-> decltype(detail::binary_dispatcher<F, V,
typename detail::result_of_binary_visit<F,
typename detail::select_type<0, Types...>::type>::type, Types...>::apply_const(v0, v1, f))
{
using R = typename detail::result_of_binary_visit<F,typename detail::select_type<0, Types...>::type>::type;
return detail::binary_dispatcher<F, V, R, Types...>::apply_const(v0, v1, f);
}
// non-const
template <typename F, typename V>
auto VARIANT_INLINE
static binary_visit(V& v0, V& v1, F f)
-> decltype(detail::binary_dispatcher<F, V,
typename detail::result_of_binary_visit<F,
typename detail::select_type<0, Types...>::type>::type, Types...>::apply(v0, v1, f))
{
using R = typename detail::result_of_binary_visit<F,typename detail::select_type<0, Types...>::type>::type;
return detail::binary_dispatcher<F, V, R, Types...>::apply(v0, v1, f);
}
~variant() noexcept
{
helper_type::destroy(type_index, &data);
}
// comparison operators
// equality
VARIANT_INLINE bool operator==(variant const& rhs) const
{
if (this->get_type_index() != rhs.get_type_index())
return false;
detail::comparer<variant, detail::equal_comp> visitor(*this);
return visit(rhs, visitor);
}
// less than
VARIANT_INLINE bool operator<(variant const& rhs) const
{
if (this->get_type_index() != rhs.get_type_index())
{
return this->get_type_index() < rhs.get_type_index();
// ^^ borrowed from boost::variant
}
detail::comparer<variant, detail::less_comp> visitor(*this);
return visit(rhs, visitor);
}
}; };
// unary visitor interface // unary visitor interface
// const // const
template <typename V, typename F> template <typename V, typename F>
auto VARIANT_INLINE static apply_visitor(F f, V const& v) -> decltype(V::visit(v, f)) auto VARIANT_INLINE static apply_visitor(F f, V const& v) -> decltype(V::visit(v, f))
@ -900,13 +73,13 @@ auto VARIANT_INLINE static apply_visitor(F f, V & v0, V & v1) -> decltype(V::bin
} }
// getter interface // getter interface
template<typename ResultType, typename T> template <typename ResultType, typename T>
ResultType & get(T & var) ResultType & get(T & var)
{ {
return var.template get<ResultType>(); return var.template get<ResultType>();
} }
template<typename ResultType, typename T> template <typename ResultType, typename T>
ResultType const& get(T const& var) ResultType const& get(T const& var)
{ {
return var.template get<ResultType>(); return var.template get<ResultType>();

View file

@ -1,74 +0,0 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_UTIL_VARIANT_IO_HPP
#define MAPNIK_UTIL_VARIANT_IO_HPP
namespace mapnik { namespace util {
namespace detail {
// operator<< helper
template <typename Out>
class printer
{
public:
explicit printer(Out & out)
: out_(out) {}
printer& operator=(printer const&) = delete;
// visitor
template <typename T>
void operator()(T const& operand) const
{
out_ << operand;
}
/// specialized visitor for boolean
void operator()(bool const & val) const
{
if (val) {
out_ << "true";
} else {
out_ << "false";
}
}
private:
Out & out_;
};
} // namespace detail
// operator<<
template <typename charT, typename traits, typename... Types>
VARIANT_INLINE std::basic_ostream<charT, traits>&
operator<< (std::basic_ostream<charT, traits>& out, variant<Types...> const& rhs)
{
detail::printer<std::basic_ostream<charT, traits>> visitor(out);
apply_visitor(visitor, rhs);
return out;
}
}}
#endif // MAPNIK_UTIL_VARIANT_IO_HPP

View file

@ -24,6 +24,7 @@
#define MAPNIK_WKB_HPP #define MAPNIK_WKB_HPP
// mapnik // mapnik
#include <mapnik/config.hpp>
#include <mapnik/geometry.hpp> #include <mapnik/geometry.hpp>
#include <mapnik/util/noncopyable.hpp> #include <mapnik/util/noncopyable.hpp>

View file

@ -46,8 +46,7 @@
#include <mapnik/group/group_layout.hpp> #include <mapnik/group/group_layout.hpp>
#include <mapnik/group/group_symbolizer_properties.hpp> #include <mapnik/group/group_symbolizer_properties.hpp>
#include <mapnik/util/variant.hpp> #include <mapnik/util/variant.hpp>
#include <mapnik/util/variant_io.hpp> #include <mapbox/variant/variant_io.hpp>
#pragma GCC diagnostic push #pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp> #include <mapnik/warning_ignore.hpp>
#include <boost/algorithm/string.hpp> #include <boost/algorithm/string.hpp>